Mark Waid posted this video yesterday on InMediaRes. In case you're not familiar with Mark, for some time now he has been leading a team of artists in developing new digital comic ideas.
The demo below is one example. As you can see, it's designed to work with a landscape view, not the portrait view of most paper comics.
This concept explores how digital comic can use time to tell story. Tapping the screen advances the story and adds word balloons, new frames, and changes existing frames.
It breaks with paper comics in a number of different ways, but it sticks with the concept of a finite page. There's no sign that if you change orientation that the content would shift. I'm not sure how much use this would be for different screen dimensions.
This is interesting, but it doesn't blow me away like the demo I showed you last November. That was Pablo Defendini's work, and it's still impressive.